Comparing cannabis with tobacco: Arithmetic does not add up

doi:10.1136/bmj.327.7407.165

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Les Iversen (les.iversen@pharm.ox.ac.uk), professor

Department of Pharmacology, University of Oxford, Oxford OX1 3QT

EDITOR—The editorial by Henry et al comparing cannabis with tobacco implies that in the future as many as 30 000 deaths a year in Britain may be caused by smoking cannabis.1 But this conclusion seems to have been based on a series of questionable assumptions.

To expose the lungs to the same amount of …